Radio static shield



Jan- 15, 1935 M. s.'sKAER ET Ax.

RADIO STTIC SHIELD Suasa/woz moyZem'g. Ska/e7 Ea TZ M1 l vom Z': s l A lttousuo.

Filed Oct. 6, 1933 Patented `au. l5, 1935`V UNITED STATES`- PATENT ,OFFICE Application October B. 1933, Serial No. 692,518

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lIhe invention aims to provide an effective shield to prevent electrical discharges from distributors or spark plugs of motor ignition systems, from interfering with radio reception, and to protect the distributor and/or-spark plugs and the associated wiring against water. The invention is therefore adapted primarily for radio-equipped automobiles, boats and aircraft driven by internal combustion engines, but may alsobeusedwherever the operation of such an engine interferes with radio reception.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, description being accomplished by reference to the accompanying drawing.

Fig. 1 is -al side elevation partly broken away l and in section showing the shield applied to an ignition distributor and its wiring.

Pig. 2 is a horizontal sectional view on line 2-2 of Fig. 1.

.Fig 3 is an upper end view of the shield.

We have shown the shield only in connection with s distributor D and its wiring w, said wiring being connected in the usual way with the ignition coil (not shown) and the spark plugs, one of which is illustrated at P. 'I'he invention however, could well be used in connection with other ignition parts and associated wiring, if found desirable, andit will be clear that by constructing the shield in smaller size','one could -be used Vupon each. spark plug. l

v 'Ihe shield includes an elongated insulating sleeve 5 preferably formed from flexible rubber, said sleeve having a relatively large open end 6 to snugly surround the distributor D, and a contracted end 7 to surround the wiring W, said end 'I being provided with an appropriate clamp 8 whereby it may be contracted around the wiring p and held in substantially fluid-tight engagement therewith.

A tubular metal screen 9 of open mesh form,

is embedded in and dispod in concentric relation with the sleeve 5, so that said sleeve land screen jointlysurround the wiring and the distributor. One or morewground wires are connected with the screen are suitably ground,-

-Qnd in the Drent-Bhowin. we have illustratedonegi'oundwireloconnected withtbe upper end of the screen 9 and a lower wire 1l connected with the lower end of said screen, said wires being grounded upon the motor, the frame of the vehicle or any other appropriate part,v as indicated at l2 and i3 respectively.

The shields intended to be used with conventional radio equipment, such as condensers and ignition Suppressors, and at S, two of these suppressors have been illustrated. The shield eliminates electrical interferences and thereby greatly 10 improves radio reception. Moreover, it forms an effective protection against ignition troubles caused by water, for the parts surrounded by the shield are effectively protected against rain, splashing water, etc.

1. In combination with ignition wiring and an ignition part connected therewith; an insulating rubber sleeve surrounding the adjacent portions of said wiring and ignition partV and connected 20 therewith in a substantially watertight manner.

a tubular metallic woven wire' screen concentric with and embedded in said sleeve, and a ground wire connected with said metallic screen.

2. A static shield for ignition wiring'and an 25 ignition part connected with said wiring, said shield comprising an insulating sleeve of rubber having a relatively large open end to snugly surround said ignition part, and a contracted end to snugly surround said wiring, a tubular metallic 30. woven wire screen concentric with and embedded in said sleeve, and a ground wire connected with said metallic screen.

3. In combination with an ignition distributor 35 and a plurality of ignition wires extending upwardly therefrom; a vertically disposed longitudinally tapered rubber sleeve having its contracted end disposed upwardly and surrounding said ignition wires at a point spaced considerably 40 above said distributor', said rubber sleeve having its larger lower end disposed snugly around said distributor, a woven wire tubular screen concentric with, embedded in and extending substantially throughout the length of said rubber sleeve, and 45 a ground wire connected to said woven wire screen and extending to t' e exterior of said rubber sleeve.

MOYLE S. BKAERL EARL HOIEOIIB. 

